689457 has 4 divisors (see below), whose sum is σ = 919280. Its totient is φ = 459636.

The previous prime is 689441. The next prime is 689459. The reversal of 689457 is 754986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 689457 - 2⁴ = 689441 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (689459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114907 + ... + 114912.

It is an arithmetic number, because the mean of its divisors is an integer number (229820).

2⁶⁸⁹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

689457 is a deficient number, since it is larger than the sum of its proper divisors (229823).

689457 is a wasteful number, since it uses less digits than its factorization.

689457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229822.

The product of its digits is 60480, while the sum is 39.

The square root of 689457 is about 830.3354743717. The cubic root of 689457 is about 88.3423731898.

The spelling of 689457 in words is "six hundred eighty-nine thousand, four hundred fifty-seven".